Term used to describe the state of crotch chafing. Abrasions on thighs and groin caused by sand from a beach, rough clothing material, and fat legs on a long walk. Not unlike sand in the vagina or grit-nuts and sandpaper crack.

Dude, I've got the worse case of sadie rotten crotch, I'm walkin' like I just got off of cross country horse-back ride.